content: /**
   * Copyright (c) 2016-present, RxJava Contributors.
   *
   * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in
   * compliance with the License. You may obtain a copy of the License at
   *
   * http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software distributed under the License is
   * distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See
   * the License for the specific language governing permissions and limitations under the License.
   */
  
  package io.reactivex.interop.internal.operators;
  
  import java.util.Collection;
  import java.util.concurrent.Callable;
  
  import org.reactivestreams.Subscription;
  
  import hu.akarnokd.reactivestreams.extensions.RelaxedSubscriber;
  import io.reactivex.common.Disposable;
  import io.reactivex.common.exceptions.Exceptions;
  import io.reactivex.common.internal.functions.ObjectHelper;
  import io.reactivex.common.internal.utils.ArrayListSupplier;
  import io.reactivex.flowable.*;
  import io.reactivex.flowable.extensions.FuseToFlowable;
  import io.reactivex.flowable.internal.operators.FlowableToList;
  import io.reactivex.flowable.internal.subscriptions.SubscriptionHelper;
  import io.reactivex.observable.*;
  import io.reactivex.observable.internal.disposables.EmptyDisposable;
  
  public final class FlowableToListSingle<T, U extends Collection<? super T>> extends Single<U> implements FuseToFlowable<U> {
  
      final Flowable<T> source;
  
      final Callable<U> collectionSupplier;
  
      @SuppressWarnings("unchecked")
      public FlowableToListSingle(Flowable<T> source) {
          this(source, (Callable<U>)ArrayListSupplier.asCallable());
      }
  
      public FlowableToListSingle(Flowable<T> source, Callable<U> collectionSupplier) {
          this.source = source;
          this.collectionSupplier = collectionSupplier;
      }
  
      @Override
      protected void subscribeActual(SingleObserver<? super U> s) {
          U coll;
          try {
              coll = ObjectHelper.requireNonNull(collectionSupplier.call(), "The collectionSupplier returned a null collection. Null values are generally not allowed in 2.x operators and sources.");
          } catch (Throwable e) {
              Exceptions.throwIfFatal(e);
              EmptyDisposable.error(e, s);
              return;
          }
          source.subscribe(new ToListSubscriber<T, U>(s, coll));
      }
  
      @Override
      public Flowable<U> fuseToFlowable() {
          return RxJavaFlowablePlugins.onAssembly(new FlowableToList<T, U>(source, collectionSupplier));
      }
  
      static final class ToListSubscriber<T, U extends Collection<? super T>>
      implements RelaxedSubscriber<T>, Disposable {
  
          final SingleObserver<? super U> actual;
  
          Subscription s;
  
          U value;
  
          ToListSubscriber(SingleObserver<? super U> actual, U collection) {
              this.actual = actual;
              this.value = collection;
          }
  
          @Override
          public void onSubscribe(Subscription s) {
              if (SubscriptionHelper.validate(this.s, s)) {
                  this.s = s;
                  actual.onSubscribe(this);
                  s.request(Long.MAX_VALUE);
              }
          }
  
          @Override
          public void onNext(T t) {
              value.add(t);
          }
  
          @Override
          public void onError(Throwable t) {
              value = null;
              s = SubscriptionHelper.CANCELLED;
              actual.onError(t);
          }
  
          @Override
          public void onComplete() {
              s = SubscriptionHelper.CANCELLED;
              actual.onSuccess(value);
          }
  
          @Override
          public void dispose() {
              s.cancel();
              s = SubscriptionHelper.CANCELLED;
          }
  
          @Override
          public boolean isDisposed() {
              return s == SubscriptionHelper.CANCELLED;
          }
      }
  }
  